How Do Sieve Tube Member (Stm)cells Differ from Tracheids

How do sieve tube member (stm) cells differ from tracheids?

A) stm cells occur in angiosperms;tracheids only occur in gymnosperms
B) stm cells function as living cells;tracheids function as dead cells
C) stm cells lack a companion cell;tracheids have a companion cell
D) stm cells have secondary cell walls;tracheids have only a primary cell wall
E) stm cells are found in vascular rays;tracheids are found only in parenchyma

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